The GRUB package still needs some polish. I generated a configuration using grub-mkconfig with unchanged defaults in /etc/default/grub.
GRUB gettext tries to load /boot/grub/locale/en.mo.gz, which isn't there:
(You regularly can't see this message, because its only displayed for about 1 millisecond.)
At least on my virtual machine it loads a huge font from /usr/share/grub/fonts/dejavusansmono.pf2 and sets the screen mode to 640x480 by default, so the menu looks like the output of a Commodore VIC-20:
GRUB's text mode menu assumes, that its terminal is at least 80x24. I think unifont.pf2 should be used, but it isn't there. And should not fonts be loaded from /boot/grub/fonts instead of /usr/share/grub/fonts? Because /usr may not be accessible from a /boot partition.